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Publication numberUS5017707 A
Publication typeGrant
Application numberUS 07/261,947
Publication dateMay 21, 1991
Filing dateOct 24, 1988
Priority dateNov 11, 1987
Fee statusPaid
Also published asDE3738240A1, EP0315901A2, EP0315901A3, EP0315901B1
Publication number07261947, 261947, US 5017707 A, US 5017707A, US-A-5017707, US5017707 A, US5017707A
InventorsHorst Berneth, Hubert Psaar, Gert Jabs
Original AssigneeBayer Aktiengesellschaft
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tetraindolylheptamethine dyestuffs
US 5017707 A
Abstract
Tetraindolylheptamethine ethers and alcohols of the isomeric formulae ##STR1## and ##STR2## and dyestuffs of the formula ##STR3## in which A, B, D and E denote ##STR4## and D'.sup.⊕ denotes ##STR5## and the remaining symbols have the meanings given in the description, are used in pressure- and heat-sensitive recording materials.
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Claims(5)
We claim:
1. Tetraindolylheptamethine dyestuffs of the formula ##STR149## in which A1, B1 and E1 denote ##STR150## and can be identical to or different from one another, D.sup.⊕ stands for ##STR151## and X.sup.⊖ stands for an anion Q1 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl, phenyl or naphthyl radicals, which are optionally substituted by C1 to C4 alkyl, chlorine and/or C1 to C4 alkoxy,
R3 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, or naphthylmethyl radicals which are optionally substituted by C1 to C4 alkyl, chlorine and/or C1 to C4 alkoxy,
R4 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl, phenyl, or naphthyl, radicals which are optionally substituted by C1 to C4 alkyl, chlorine, bromine, C1 to C4 alkoxy, cyano, nitro and/or C1 to C4 alkoxycarbonyl,
T6 to T10 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or vinyl, allyl, cyclopentyl, cyclohexyl, fluorine, chlorine, bromine, C1 to C8 alkoxy which can additionally be substituted by C1 to C4 alkoxy, or C1 to C4 dialkylamino, nitro, cyano, C1 to C4 alkoxycarbonyl, or benzyl, phenethyl, naphthylmethyl, phenyl, or naphthyl, radicals which are optionally substituted by C1 to C4 alkyl, chlorine, C1 to C4 alkoxy, C1 to C4 alkylsulphonyl, cyano and/or C1 to C4 alkoxycarbonyl,
U2 denotes hydrogen, C1 to C8 alkyl, allyl, cyclohexyl, benzyl, phenyl, hydroxyl, C1 to C4 alkoxy, chlorine, bromine, C1 to C4 dialkylamino, nitro, cyano, C1 to C4 alkylthio, C1 to C4 alkoxycarbonyl, C1 to C4 dialkylaminocarbonyl, C1 to C4 alkoxycarbonyloxy or C1 to C4 alkylsulphonyl and
n denotes 1 or 2.
2. Tetraindolylheptamethine ethers or alcohols of the formula ##STR152## in which A1, B1, D1 and E1 denote ##STR153## and can be identical to or different from one another, Q1 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl, phenyl or naphthyl radicals, which are optionally substituted by C1 to C4 alkyl, chlorine and/or C1 to C4 alkoxy,
R3 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, or naphthylmethyl radicals which are optionally substituted by C1 to C4 alkyl, chlorine and/or C1 to C4 alkoxy,
R4 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl,
which are optionally substituted by C1 to C4 alkyl, chlorine, bromine, C1 to C4 alkoxy, cyano, nitro and/or C1 to C4 alkoxycarbonyl,
T6 to T10 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or vinyl, allyl, cyclopentyl, cyclohexyl, fluorine, chlorine, bromine, C1 to C8 alkoxy which can additionally be substituted by C1 to C4 alkoxy, or C1 to C4 dialkylamino, piperidino, pyrrolidino, nitro, cyano, C1 to C4 alkoxycarbonyl, or benzyl, phenethyl, naphthylmethyl, phenyl, or naphthyl, radicals which are optionally substituted by C1 to C4 alkyl, chlorine, C1 to C4 alkoxy, C1 to C4 alkylsulphonyl, cyano and/or C1 to C4 alkoxycarbonyl,
U2 denotes hydrogen, C1 to C8 alkyl, allyl, cyclohexyl, benzyl, phenyl, hydroxyl, C1 to C4 alkoxy, chlorine, bromine, C1 to C4 dialkylamino, nitro, cyano, C1 to C4 alkylthio, C1 to C4 alkoxycarbonyl, C1 to C4 dialkylaminocarbonyl, C1 to C4 alkoxycarbonyloxy or C1 to C4 alkylsulphonyl
n denotes 1 or 2.
3. Tetraindolylheptamethine ethers or alcohols according to claim 2, in which
Q1 denotes hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, ethoxy or cyano, or allyl, cyclopentyl, cyclohexyl, or benzyl, or phenethyl, radicals which are optionally substituted by methyl, chlorine or methoxy,
R3 denotes hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, ethoxy, cyano or methoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, or phenethyl radicals which are optionally substituted by methyl, chlorine or methoxy,
R4 denotes hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, ethoxy, cyano or methoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, or phenethyl, phenyl, naphthyl, radicals which are optionally substituted by methyl, chlorine, methoxy, cyano, nitro and/or methoxycarbonyl,
T6 and T10 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, cyano or methoxycarbonyl, or vinyl, allyl, cyclopentyl, cyclohexyl, chlorine, C1 to C8 alkoxy, cyano, methoxycarbonyl, nitro, benzyl, or phenyl radicals which are optionally substituted by methyl, chlorine, cyano or methoxy,
T7 to T9 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, cyano or methoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, chlorine, bromine, cyano, methoxycarbonyl and ethoxycarbonyl, nitro, C1 to C4 alkoxy, C1 to C4 dialkylamino, benzyl, or phenyl, or naphthyl, radicals which are optionally substituted by methyl, ethyl, chlorine, methoxy, ethoxy, cyano, nitro and/or methoxycarbonyl, or
T7 with T8 or T9 or T8 with T9 denote a bridge of the formulae ##STR154## U2 denotes hydrogen, C1 to C4 alkyl, cyclohexyl, benzyl, C1 to C4 alkoxy, chlorine, C1 to C4 dialkylamino, nitro, cyano, methoxycarbonyl or ethoxycarbonyl or methylsulphonyl, it being possible for U2 to be in the 5-, 6- and/or 7-position on the indolyl radical being in the 7-position to form, together with R3, a bridge of the formulae ##STR155## and n denotes 1 or 2.
4. Tetraindolylheptamethine ethers or alcohols according to claim 2 of the following formula ##STR156##
5. Tetraindolylheptamethine ethers or alcohols according to claim 2 of the following formula ##STR157## in which R5 is CH3,
R6 is ##STR158## Q2 is CH3, U3 and U4 are H and
T11 is CH3.
Description

The invention relates to tetraindolylheptamethine ethers and alcohols of the isomeric formulae ##STR6## and ##STR7## in which A, B, D and E denote ##STR8## and can be identical to or different from one another, Q denotes hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl or a heterocyclic radical which is bound via an alkyl,

R1 denotes hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl or a heterocyclic radical which is bound via an alkyl,

R2 denotes hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl or a heterocyclic radical which is optionally bound via an alkyl,

T1 to T5 denote hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, halogen, alkoxy, dialkylamino, cyano, hydroxycarbonyl, alkoxycarbonyl, aryl, a heterocyclic radical which is optionally bound via an alkyl, or two of the radicals T1 to T5 denote, in each case, the missing members of a five- to seven-membered ring, which can be aromatic or partially hydrogenated and can contain up to 2 heteroatoms from the series consisting of O, N or S,

U1 denotes hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl, hydroxyl, alkoxy, halogen, dialkylamino, nitro, cyano, alkylthio, alkoxycarbonyl, dialkylaminocarbonyl, alkoxycarbonyloxy or alkylsulphonyl or together with R1 denotes a C2 or C3 bridge and

n denotes 1 or 2,

and all cyclic and noncyclic radicals can carry nonionic substituents customary in dyestuff chemistry, to their preparation and use in pressure- and heat-sensitive recording materials which can be read in the infrared region from 750 to 950 nm, and also to recording materials containing these compounds.

Alkyl radicals, including those in, for example, alkoxy, alkylamino or aralkyl, can have up to 18 C atoms and can be substituted, for example by halogen, alkoxy, nitro, cyano, alkoxycarbonyl or alkylsulphonyl.

Alkenyl radicals can have up to 18 C atoms and can be substituted, for example by halogen, alkoxy, cyano or alkoxycarbonyl.

Cycloalkyl radicals can have 3 to 8 C atoms and can be substituted, for example, by alkyl, alkoxy, halogen, cyano, alkoxycarbonyl or aryl.

Aryl radicals, including those in aralkyl groups, are phenyl, naphthyl or anthracenyl, which can be substituted, for example by alkyl, alkoxy, halogen, cyano, alkoxycarbonyl, nitro, aryl or heterocyclic radicals, up to 5 substituents, which do not have to be identical, being possible.

Heterocyclic radicals, including those which are bound via an alkyl,-are 5- to 7-membered aromatic or quasiaromatic heterocycles or their partially or completely hydrogenated derivatives containing O, N, S or SO2 as heteroatoms, a maximum of 4 of these heteroatoms, which can also be mixed with respect to one another, being present in a ring and it being possible for these heterocycles to be fused with benzene, naphthalene or pyridine and/or substituted by alkyl, alkoxy, halogen, cyano, alkoxycarbonyl, nitro or aryl.

Preference is given to tetraindolylheptamethine ethers or alcohols of the isomeric formulae ##STR9## and ##STR10## in which A1, B1, D1 and E1 denote ##STR11## and can be identical to or different from one another, Q1 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl, picolyl, phenyl or naphthyl radicals which are optionally substituted by C1 to C4 alkyl, chlorine and/or C1 to C4 alkoxy,

R3 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl or picolyl radicals which are optionally substituted by C1 to C4 alkyl, chlorine and/or C1 to C4 alkoxy,

R4 denotes hydrogen, C1 to C18 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, naphthylmethyl, picolyl, quinolylmethyl, phenyl, naphthyl, pyridyl, pyrimidyl, pyrazinyl, imidazolyl, oxazolyl, thiazolyl, triazolyl, benzimidazolyl, benzoxazolyl, benzothiazolyl or quinolyl radicals which are optionally substituted by C1 to C4 alkyl, chlorine, bromine, C1 to C4 alkoxy, cyano, nitro and/or C1 to C4 alkoxycarbonyl,

T6 to T10 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, C1 to C4 alkoxy, cyano or C1 to C4 alkoxycarbonyl, or vinyl, allyl, cyclohexyl, cyclopentyl, fluorine, chlorine, bromine, C1 to C8 alkoxy which can additionally be substituted by C1 to C4 alkoxy, or C1 to C4 dialkylamino, piperidino, pyrrolidino, nitro, cyano, C1 to C4 alkoxycarbonyl, or benzyl, phenethyl, naphthylmethyl, picolyl, phenyl, naphthyl, pyridyl, quinolyl, pyrimidyl, pyrazinyl, indolyl, indolenyl, indolizinyl, imidazolyl, oxazolyl, thiazolyl, triazolyl, benzimidazolyl, benzoxazolyl or benzothiazolyl radicals which are optionally substituted by C1 to C4 alkyl, chlorine, C1 to C4 alkoxy, C1 to C4 alkylsulphonyl, cyano and/or C1 to C4 alkoxycarbonyl, or two of the radicals T6 to T10 denote, in each case, a bridge of the formulae ##STR12## U2 denotes hydrogen, C1 to C8 alkyl, allyl, cyclohexyl, benzyl, phenyl, hydroxyl, C1 to C4 alkoxy, chlorine, bromine, C1 to C4 dialkylamino, nitro, cyano, C1 to C4 alkylthio, C1 to C4 alkoxycarbonyl, C1 to C4 dialkylaminocarbonyl, C1 to C4 alkoxycarbonyloxy or C1 to C4 alkylsulphonyl or together with R3 denotes a --CH2 CH2 -- or --CH2 CH2 CH2 --bridge, which can be substituted by a maximum of 3 methyl groups, and

n denotes 1 or 2.

Particular preference is given to tetraindolylheptamethine ethers or alcohols of the formulae V to VIII,

in which

Q1 denotes hydrogen, C1 to C8 alkyl which can be substituted by chlorine methoxy, ethoxy or cyano, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl or picolyl radicals which are optionally substituted by methyl, chlorine or methoxy,

R3 denotes hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, ethoxy, cyano or methoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl or picolyl radicals which are optionally substituted by methyl, chlorine or methoxy,

R4 denotes hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, ethoxy, cyano or methoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, or benzyl, phenethyl, picolyl, phenyl, naphthyl, pyridyl, pyrimidyl, benzimidazolyl, benzoxazolyl, benzothiazolyl or quinolyl radicals which are optionally substituted by methyl, chlorine, methoxy, cyano, nitro and/or methoxycarbonyl,

T6 and T10 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, cyano or methoxycarbonyl, or vinyl, allyl, cyclopentyl, cyclohexyl, chlorine, C1 to C8 alkoxy, cyano, methoxycarbonyl, nitro, benzyl, or phenyl or pyridyl radicals which are optionally substituted by methyl, chlorine, cyano or methoxy,

T7 to T9 denote hydrogen, C1 to C8 alkyl which can be substituted by chlorine, methoxy, cyano or methoxycarbonyl, or allyl, cyclopentyl, cyclohexyl, chlorine, bromine, cyano, methoxycarbonyl and ethoxycarbonyl, nitro, C1 to C4 alkoxy, C1 to C4 dialkylamino, benzyl, or phenyl, naphthyl, pyridyl, quinolyl, pyrimidyl, indolenyl, indolizinyl, imidazolyl, oxazolyl, thiazolyl, benzimidazolyl, benzoxazolyl or benzothiazolyl radicals which are optionally substituted by methyl, ethyl, chlorine, methoxy, ethoxy, cyano, nitro and/or methoxycarbonyl, or T7 with or T8 or T9 or T8 with T9 denote a bridge of the formulae ##STR13## U2 denotes hydrogen, C1 to C4 alkyl, cyclohexyl, benzyl, C1 to C4 alkoxy, chlorine, C1 to C4 dialkylamino, nitro, cyano, methoxycarbonyl or ethoxycarbonyl or methylsulphonyl, it being possible for U2 to be in the 5-, 6- and/or 7-position on the indolyl radical or for a radical U2 being in the 7-position to form, together with R3, a bridge of the formulae ##STR14## and n denotes 1 or 2.

Very particular preference is given to tetraindolylheptamethine ethers or alcohols of the formula ##STR15## and to their isomeric forms with respect to the position of the Q2 O group, such as are represented in the formulae II to IV and VI to VIII, in which

Q2 denotes hydrogen, methyl, ethyl, propyl, butyl, hexyl, octyl, cyclohexyl or benzyl, R5 denotes methyl, ethyl, propyl, butyl, hexyl, octyl, 2-cyanoethyl, 2-methoxyethyl, 2-methoxycarbonylethyl, 2-chloroethyl, 2-acetoxyethyl, cyclohexyl, allyl or benzyl,

R6 denotes methyl, ethyl, propyl, butyl, hexyl, octyl, cyclohexyl, benzyl, phenyl, 2-, 3- or 4chlorophenyl, 2-, 3- or 4-methoxyphenyl, 4-nitrophenyl, 2,4-dichlorophenyl, 2-, 3- or 4-tolyl or 2-, 3- or 4-pyridyl,

T11 denotes hydrogen, methyl, ethyl, propyl, butyl, vinyl, 2-chloroethyl, 2-cyanoethyl, chlorine, cyano, phenyl, 4-tolyl or 4-chlorophenyl, T12 and T13 denote hydrogen, methyl, ethyl, propyl, butyl, chlorine, cyano, methoxycarbonyl, dimethylamino, phenyl, 4-tolyl, 4-chlorophenyl, pyridyl or T12 and T13 together denote a grouping of the formulae ##STR16## T14 denotes hydrogen, methyl, ethyl, propyl, butyl, chlorine, bromine, cyano, phenyl, 4-tolyl, 4-chlorophenyl, 4-nitrophenyl, 4-pyridyl, 3,3-dimethylindolen-2-yl, indolizin-2-yl, 2-benzimidazolyl, 2-benzoxazolyl or 2-benzothiazolyl,

U3 and U4 denote hydrogen, methyl, methoxy, chlorine, cyano, methoxycarbonyl or nitro.

The invention further relates to tetraindolylheptamethine dyestuffs of the formula ##STR17## in which A, B, E and T1 to T5 have the meanings given for the formulae I to IV and

D.sup.⊕ stands for ##STR18## and X.sup.⊖ stands for an anion,

to their use in optical recording materials and also to optical recording materials containing these dyestuffs.

Anions X.sup.⊖ are, for example, halide ions, BF4.sup.⊖, Clo4.sup.⊖, SiF6 2.sup.⊖, B(C6 H5)4.sup.⊖ or the anions of C1 to C18 carboxylic acids, C2 -C18 dicarboxylic acids, C1 to C18 alkanesulphonic acids, benzenemonocarboxylic, benzenedicarboxylic or benzenemonosulphonic or benzenedisulphonic, naphthalenemonocarboxylic, naphthalenedicarboxylic or naphthalenemonosulphonic or naphthalenedisulphonic acids which are optionally substituted by halogen, alkyl, alkoxy, cyano, alkoxycarbonyl, nitro or alkylsulphonyl.

The invention likewise relates to processes for the preparation of tetraindolylheptamethine ethers or alcohols of the formulae I to IV.

1. The preparation is carried out by condensation of ethylenes of the formulae ##STR19## or carbinols of the formulae ##STR20## or salts of the formulae ##STR21## or other equivalents with 1,3-dicarbonyl compounds of the formula ##STR22## or acetals or ketals thereof of the formula ##STR23## or vinylogous amidinium salts of the formula ##STR24## or vinylogous chloroimmonium salts of formulae ##STR25## or other reactive equivalents of 1,3-dicarbonyl compounds and subsequent reaction with

in which

MOQ                                                        XXII

in which

A, B, D, E, Q and T1 to T5 have the meanings given for the formulae I to IV and can be identical or different,

V stands for alkyl, aralkyl or aryl,

Y- stands for an anion,

M stands for an alkali metal ion, the equivalent of an alkaline earth metal ion or stands for NR4 and R stands for alkyl, aralkyl or aryl.

Examples of M are lithium, sodium, potassium, 1/2 magnesium, 1/2 calcium, 1/2 barium, N(C2 H5)4, ##STR26##

The condensation is usually carried out in a solvent under acid and/or basic conditions, it being possible to add a water- or alcohol-removing agent, at temperatures between room temperature and the boiling point of the medium, preferably at 40 to 140 C.

Suitable solvents are alcohols such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 1-octanol, cyclohexanol, benzyl alcohol, it being preferable to use an alcohol of the formula

HOQ                                                        XXIII

in which

Q has the meaning given under the formulae I to IV.

Other suitable solvents are esters such as methyl, ethyl or butyl acetate; chlorinated hydrocarbons such as methylene chloride, ethylene chloride, chloroform; ketones such as acetone, 2-butanone; aromatics such as benzene, toluene, xylene; chlorinated aromatics such as chlorobenzene, dichlorobenzene; carboxylic acids such as formic acid, acetic acid, propionic acid, and anhydrides such as acetic anhydride.

Suitable acids are inorganic acids such as hydrochloric acid, sulphuric acid, tetrafluoroboric acid, perchloric acid, phosphoric acid; carboxylic acids such as formic acid, acetic acid, trifluoroacetic acid; sulphonic acids such as methanesulphonic acid, ethanesulphonic acid, trifluoromethanesulphonic acid, nonafluorobutanesulphonic acid, benzenesulphonic acid, toluenesulphonic acid, phosphonic acids such as methanephosphonic acid, or ion exchangers such as those based on sulphonated styrene/ divinylbenzene polymers.

Suitable bases are amines such as triethylamine, triethanolamine, piperidine, pyrrolidine or pyridine.

Suitable water- or alcohol-removing agents are anhydrides such as acetic anhydride, trifluoroacetic anhydride, benzoic anhydride; acid chlorides such as acetyl chloride, phosphorus oxychloride, thionyl chloride, oxalyl chloride, phosgene, or inorganic oxides such as phosphorus pentoxide.

Examples of compounds of the formula XVII are: ##STR27##

Examples of compounds of the formula XVIII are: ##STR28##

Examples of compounds of the formula XIX are: ##STR29##

Examples of compounds of the formula XX are: ##STR30##

The dyestuffs of the formula X obtained by this condensation can be isolated.

However, to prepare the ethers and alcohols of the formulae I to IV, they are preferably further reacted, without isolation, with the hydroxides or alcoholates of the formula XXII. This is usually done in the condensation medium, it being possible to add water or alcohols of the formula XXIII. The temperatures are between room temperature and the boiling point of the medium, preferably between 20 and 140 C.

2. The preparation is carried out by condensation of aldehydes or ketones of the formulae ##STR31## with butadienes of the formulae ##STR32## in which the symbols have the abovementioned meaning, followed by reaction with XXII.

The condensation is usually carried out under the conditions given above for process 1.

3. The preparation of compounds I to IV, where T3 =T3', is carried out by condensation of aldehydes and ketones of the formulae XXIV and/or XXV with active methylene compounds of the formula

T3'  --CH3                                       XXVIII

in which

T3' denotes cyano, hydroxycarbonyl, alkoxycarbonyl, aryl or a heterocyclic radical,

followed by reaction with XXII.

The condensation is usually carried out in the presence or absence of solvents under acid and/or basic conditions, it being customary to add a water-removing agent, at temperatures between room temperature and the boiling point of the medium, preferably at 25 to 150 C.

Suitable solvents are chlorinated hydrocarbons such as methylene chloride, ethylene chloride; aromatics such as benzene, toluene, xylene; chlorinated aromatics such as chlorobenzene, dichlorobenzene and carbon disulphide.

Suitable acids are inorganic acids such as sulphuric acid, tetrafluoroboric acid, perchloric acid; carboxylic acids such as formic acid, acetic acid, trifluoroacetic acid; sulphonic acids such as methanesulphonic acid, ethanesulphonic acid, trifluoromethanesulphonic acid, benzenesulphonic acid, toluenesulphonic acid.

Suitable bases are amines such as triethylamine, piperidine and quinoline.

Suitable dehydrating agents are anhydrides such as acetic anhydride; acid chlorides such as acetyl chloride, phosphorus oxychloride, phosphorus trichloride, thionyl chloride, oxalyl chloride, phosgene; inorganic oxides such as phosphorus pentoxide; or Lewis acids such as zinc chloride, iron chloride, aluminium chloride, boron trichloride, boron trifluoride, tin tetrachloride.

Examples of compounds of the formula XXVIII are: ##STR33## or equivalents of compounds of the formula XXVIII ##STR34## which after condensation give products which are similar to those of the corresponding compounds of the formula XXVIII.

The dyestuffs of the formula X obtained by the condensation can be isolated. However, they are preferably further reacted, without isolation, with the hydroxides or alcoholates of the formula XXII. This is done in the manner described above.

The invention relates also to mixtures of compounds I to IV. The substituents A, B, D, E and T1 to T5 can be identical to or different from one another. The mixtures can be obtained by mixing the components. Preference is given to mixtures which are obtained directly in processes 1 to 3. They may contain several isomers, depending on the substituents of the starting components and their mixes.

These mixtures are usually distinguished by a particularly high solubility in the solvents which are commonly used.

The tetraindolylheptamethine ethers or alcohols of the formulae I to IV and their mixtures are colourless to brownish solids.

Solutions in acetic acid show strong absorption with a maximum in the region from 750 to 950 nm. In addition, very weak absorption with a maximum in the region from 500 to 650 nm is found.

If a solution in toluene, which is colourless to beige, is brought into contact with acid clay or silica gel, a bluish to greenish grey colour develops spontaneously. In addition, in the near infrared region from 750 to 950 nm, a very strong absorption can be measured, for example using Dr. Lange colour measuring system Xenocolor LS 100.

If a sample of an ether or alcohol of the formulae I to IV is ground together with 2,2-bis(4-hydroxyphenyl)propane, a colourless to beige powder is obtained. If this powder is heated, for example in a melting point tube, a strong black-blue colour develops above about 100 C.

Accordingly, the tetraindolylheptamethine ethers or alcohols of the formulae I to IV are highly suitable according to the invention for pressure- or heat-sensitive recording materials which can be read in the infrared region from 750 to 950 nm.

Recording materials which absorb in the near infrared are required for reading the recorded information using suitable instruments. The spread of computers and automatic data processing require instruments which are capable of reading the information contained in documents. Therefore, machines for optical character recognition (OCR) have been developed which are capable of reading pages of text which have been written in the character type programmed in each case. Such machines usually operate in the near infrared, and therefore the characters to be read must of course have absorptions in the near infrared. However, conventional pressure- and heatsensitive recording materials do not have such an absorption in the near infrared.

Recording materials which do have such an absorption in the near infrared are described, for example, in U.S. Pat. Nos. 4,020,056, 4,022,771, 4,026,883, 4,107,428 and 4,119,776 and in European Application 0,124,377.

The tetraindolylheptamethine ethers and alcohols according to the invention of the formulae I to IV and their mixtures have been found to be highly suitable for these OCR-readable recording materials. For this, in addition to their strong absorption in the region from 750 to 950 nm, especially the weak absorption in the visible spectral region is particularly advantageous because the compounds according to the invention can therefore be added in a simple manner to existing colour former mixtures, which develop, for example, blue or black colours in a known manner, without this colour being significantly affected by the developing colour of the compounds according to the invention.

Suitable colour formers which can be mixed with the tetraindolylheptamethine ethers or alcohols according to the invention of the formulae I to IV originate, for example, from the following classes of substances: phthalides, fluoranes, spirodipyrans, chromenoindoles, phenoxazines, phenothiazines, carbazolylmethanes, dihydroquinazolones, dihydro-3,1-benzoxazin-2-ones, 3,1-benzoxazines or other triarylmethane leuco dyestuffs.

The preparation of these pressure- or heatsensitive recording materials is carried out in a known manner.

A pressure-sensitive material consists, for example, of at least 1 pair of sheets containing at least one colour former of the formulae I to IV, dissolved or dispersed in a non-volatile organic solvent, and one acid developer.

Such processes and formulations are known, for example, from U.S. Pat. Nos. 2,800,457, 2,800,458, 2,948,753, 3,096,189 and 3,193,404 and from German Offenlegungsschriften 2,555,080 and 2,700,937.

To avoid a premature activation of the colour formers present in the pressure-sensitive recording material, these colour formers are preferably enclosed in microcapsules which can usually be broken by applying pressure.

Suitable capsule wall materials are, for example, gelatin/gum arabic, polyamides, polyurethanes, polysulphonamides, polyesters, polycarbonates, polysulphonates, polyacrylates and phenol/formaldehyde, melamine/ formaldehyde or urea/formaldehyde condensates, such as are described, for example, in M. Gutcho, Capsule Technology and Microencapsulation, Noyes Data Corporation 1972, G. Baster, Microencapsulation, Processes and Applications, editor J.E. Vandegaar and in German Offenlegungsschriften 2,237,545 and 2,119,933.

Preferably, those microcapsules are used whose casings consist of polyaddition products of polyisocyanates and polyamines.

Isocyanates, amines, solvents and a suitable process for preparing such microcapsules are described, for example, in German Offenlegungsschrift 3,203,059.

Likewise, those microcapsules are preferably used whose casings consist of polyamides or melamine/formaldehyde condensates or gelatin/gum arabic.

Suitable developers are clays, clays modified by acids, oxides or acid salts and also monomeric or polymeric phenols or carboxylic acids.

The tetraindolylheptamethine ethers and alcohols of the formulae I to IV are usually sufficiently to highly soluble in the non-volatile organic solvents customary for microencapsulation.

Thermoreactive recording systems comprise, for example, heat-sensitive recording and copying materials and papers.

Such a material is described, for example, in German Offenlegungsschrift 2,555,080.

Suitable developers are the same electron acceptors which are used in pressure-sensitive papers, preferably phenolic compounds, which are described, for example, in German Patent 1,251,348, and also boric acid and organic, preferably aliphatic dicarboxylic acids.

A further suitable thermoreactive developing system is described in German Offenlegungsschrift 3,337,296, in which acid-modified polymers, preferably of acrylonitrile, act as developers.

The tetraindolylheptamethine dyestuffs of the formula X are suitable for optical recording materials.

These optical recording materials comprise lightabsorbing coating on a substrate, in most cases a plastic sheet. This coating frequently also contains a binder in addition to the dyestuff. Advantageously, it is applied from a solution, for example by spin coating. This coating must be very thin, very even and of high optical quality. In addition, it must absorb strongly in the region of the light source. The light source used comprises lasers, preferably laser diodes which operate in the wavelength region from 700 to 1,400 nm.

The preparation of these coatings and their use for optical recording is described, for example, in WO 84/02795 and EP 0,023,736.

Because of their appreciable absorption in the range from 750 to 950 nm, the tetraindolylheptamethine dyestuffs of the formula X are especially highly suitable for use in optical recording materials. Mixtures are likewise suitable. They are readily soluble in the solvents customary for coating. These solvents are, for example, chlorinated hydrocarbons, for example methylene chloride, 1,2-dichloroethane; ketones, for example 2-butanone, cyclohexanone; aromatics, for example xylene; esters, for example ethyl or butyl acetate; alcohols, for example methanol, ethanol or butanol or mixtures thereof. Preference is given to alcohols because they do not attack the plastic sheet.

Suitable binders are all film-forming materials, preferably polymers, for example polystyrene, poly-α-methylstyrene, polymethyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyvinyl acetate/vinylpyrrolidone, polycarbonate, cellulose nitrate, cellulose acetate/butyrate or mixtures or copolymers thereof.

EXAMPLE 1

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl)ethylene and 4.3 g of 1,1,3,3-tetramethoxypropane are stirred in a mixture of 50 ml of acetic anhydride and 2.5 g of methanesulphonic acid at 80 C. for 1 hour. The black-blue solution containing the dyestuff of the formula ##STR35## is poured into 200 ml of methanol and made alkaline with 50 ml of 30% strength methanolic sodium methylate solution. The beige-brown product is filtered off with suction, washed with methanol and water, and dried:

22.0 g (94.6% of theory). The product is boiled in 200 ml of methanol for 2 hours, cooled, filtered off with suction and dried:

18.5 g (79.6%) of brownish-beige powder of melting point 216-218 C.

The product in one isomeric form corresponds to the formula: ##STR36## A solution in glacial acetic acid has a dirty blue colour and λmax of 863 nm. A solution in toluene in contact with acid clay develops a pale grey-blue colour.

In the infrared, an absorption extending from 750 to 950 nm is measured.

The following examples can be prepared analogously

__________________________________________________________________________ ##STR37##                               λmax in glacialExampleR5   R6    Q2   acetic acid__________________________________________________________________________2    C2 H5           ##STR38## CH3  864 nm3    n-C4 H9           ##STR39## CH3  867 nm4    n-C8 H17           ##STR40## CH3  867 nm ##STR41##           ##STR42## CH3  874 nm6    CH3           ##STR43## CH3  870 nm7    CH3           ##STR44## CH3  865 nm8    CH3           ##STR45## C2 H5                               862 nm9    CH3           ##STR46## C(CH3)3                               859 nm10   CH(CH3)2           ##STR47## n-C4 H9                               867 nm11   CH3           ##STR48##                      ##STR49##                               863 nm12   CH3  CH3   CH3  818 nm13 ##STR50##          CH3   CH3  824 nm14   CH3  n-C4 H9                     CH3  820 nm15   CH3  n-C8 C17                     CH3  820 nm16   CH2 CH2 CN           ##STR51## CH3  852 nm17   CH2 CH2 OCH3          n-C6 H13                     C2 H5                               825 nm__________________________________________________________________________
EXAMPLE 18

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl)ethylene and 4.3 g of 1,1,3,3-tetramethoxypropane are boiled in a mixture of 100 ml of butanol and 5 g of concentrated hydrochloric acid for 1 hour.

This gives a solution of the dyestuff of the formula ##STR52## which can be used for the preparation of optical recording materials. The dyestuff can be isolated by evaporation of the solvent.

To isolate the ether, the solution is cooled and 38 ml of a 2 molar butanolic potassium butylate solution are added dropwise. The product is filtered off with suction, washed with butanol and hexane and dried. The brownish product is extracted in a hot extractor with methylcyclohexane, the first portions being discarded. In this manner, 10.5 g (42.6%) of a pale beige powder of melting point 202 to 205 C. are obtained. In one isomeric form it corresponds to the formula ##STR53##

λmax in glacial acetic acid: 860 nm. In contact with acid clay: grey-blue, 750 to 950 nm.

The following examples can be prepared analogously:

__________________________________________________________________________ ##STR54##                                                  λmax                                                  in glacialExampleR5    R6    Q2   U3                                     U4                                          T11                                                  acetic__________________________________________________________________________                                                  acid19   CH3            ##STR55## C2 H5                                H    H    H       857 nm20   CH2 CHCH2            ##STR56## n-C4 H9                                H    H    CH3                                                  872 nm21   CH3            ##STR57## n-C8 H17                                H    Cl   H       865 nm22   CH3            ##STR58##                       ##STR59##                                OCH3                                     H    H       870 nm23   CH3            ##STR60##                       ##STR61##                                CH3                                     CH3                                          H       865 nm24   C2 H5            ##STR62## CH3  CH3                                     H    H       864 nm25   CH3            ##STR63## CH3  H    H    CH3                                                  862 nm26   CH3            ##STR64## CH3  H    H    CH2 CH2 Cl                                                  867 nm27   CH3            ##STR65## C2 H5                                Cl   H    C2 H5                                                  863 nm28   CH3   CH3   CH(CH3)2                                H    H                                           ##STR66##                                                  800 nm29   H          CH3   CH3  H    H    CN      791 nm30   CH3            ##STR67## CH3  H    H    Cl      900 nm31   CH3   H          n-C3 H7                                H    H    CH2 CH2 CN                                                  815 nm32 ##STR68##            ##STR69## CH3  H    H    H       870 nm33   CH3            ##STR70## C2 H5                                NO2                                     H    H       858 nm34 ##STR71## CH3   C(CH3)3                                H    CN   H       830__________________________________________________________________________                                                  nm
EXAMPLE 35

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) ethylene and 7.35 g of dimethyl-(3-chloro-3-phenylprop-2-en-1-ylidene)ammonium perchlorate are boiled in 50 ml of acetic anhydride for 1.5 hours. The mixture is cooled and poured into 250 ml of methanol, precipitating the dyestuff of the formula ##STR72## as a black powder. This suspension is then made alkaline with methanolic sodium methylate solution. The dark brown powder is filtered off with suction, washed with water and dried. It is dissolved in acetonitrile with heating, filtered, cooled and filtered off with suction: 3.0 g (11.8%) of a brown powder. In one isomeric form it corresponds to the formula ##STR73##

λmax in glacial acetic acid: 897 nm.

The following examples can be prepared analogously:

__________________________________________________________________________ ##STR74##                                                 λmax in                                                 glacialExampleR5     R6     Q2   T12    T13                                          T14                                                 acetic__________________________________________________________________________                                                 acid36   CH3      ##STR75##  CH2C(CH3)3                            ##STR76##  H  H      895 nm37   CH3      ##STR77##  C2 H5                            ##STR78##  H  H      885 nm38   CH3      ##STR79##  CH3                            ##STR80##  H  H      905 nm39   CH3      ##STR81##  CH3                            ##STR82##  Cl H      900 nm40   C2 H5      ##STR83##  CH3  N(CH3)2                                       H  H      770 nm41   CH3      ##STR84##  CH3                            ##STR85##  H                                           ##STR86##                                                 802 nm42   n-C4 H9      ##STR87##  CH3                            ##STR88##  (CH2)3                                                 765__________________________________________________________________________                                                 nm
EXAMPLE 43

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) ethylene and 8.1 g of dimethyl-(3-dimethylamino-2-(4-pyridyl)-2-propen-1-ylidene)ammonium chloride are boiled in a mixture of 50 ml of acetic anhydride and 2.9 g of methanesulphonic acid for 37 hours. After cooling, the mixture is poured into 250 ml of methanol to give a blue solution containing the dyestuff of the formula ##STR89## 125 ml of 30% strength methanolic sodium methylate solution are added to this solution to give 20.0 g (78.3%) of a brownish powder. In one isomeric form it corresponds to the formula ##STR90## λmax in glacial acetic acid: 850 nm.

The following examples can be prepared analogously:

__________________________________________________________________________ ##STR91##                                            λmax in glacialExampleR5    R6     Q2                            T14        acetic__________________________________________________________________________                                            acid44   CH3            ##STR92##  n-C4 H9                             ##STR93##      856 nm45   C2 H5            ##STR94##  CH3                             ##STR95##      860 nm46 ##STR96## C2 H5                       CH3                            CN              800 nm__________________________________________________________________________
EXAMPLE 47

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) ethylene and sodium 2-(benzothiazol-2-yl)-3-oxo-prop-1-en-1-olate are stirred in a mixture of 50 ml of acetic anhydride and 7.7 g of trifluoromethanesulphonic acid at 90 C. for 1 hour. After cooling, the greenish blue solution containing the dyestuff of the formula ##STR97## is poured into 250 ml of methanol and made alkaline with methanolic methylate solution. The product is filtered off with suction and washed with methanol and water. Upon recrystallization from butanol, 22.3 g (82.8%) of a yellow powder of melting point 217 to 219 C. are obtained. The product one isomeric form corresponds to the formula ##STR98## λmax in glacial acetic acid: 859 nm. In contact with acid clay: greenish grey, 750 to 950 nm.

The following examples can be prepared analogously:

__________________________________________________________________________ ##STR99##                                                  λmax in                                                  glacialExampleR5   R6     Q2    T11                                     T14     acetic__________________________________________________________________________                                                  acid48 ##STR100##          CH3    CH3   CH3                                      ##STR101##  815 nm49   CH3           ##STR102##                       ##STR103##                                 H                                      ##STR104##  858 nm50   CH3           ##STR105## CH(CH3)2                                 H   CN           800 nm51   CH3           ##STR106##                       ##STR107##                                 H                                      ##STR108##  859 nm52   C2 H5           ##STR109## CH3   H                                      ##STR110##  851 nm53   CH3           ##STR111## n-C4 H9                                 CH3                                      ##STR112##  859 nm54   CH3           ##STR113## CH3   H                                      ##STR114##  857 nm55   CH3           ##STR115## CH3   H                                      ##STR116##  858 nm56   CH(CH3)2           ##STR117## C2 H5                                 H                                      ##STR118##  859 nm57   CH3           ##STR119## CH3   H   CH3     857 nm58   CH3           ##STR120## CH3   H   Br           869__________________________________________________________________________                                                  nm
EXAMPLE 59

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) ethylene and 4.4 g of 2,3-dichloromalealdehydic acid are boiled in a mixture of 50 ml of glacial acetic acid, 5.2 g of acetic anhydride and 0.9 g of piperidine for 4 hours. After cooling, the blue solution containing the dyestuff of the formula ##STR121## is poured into 200 ml of methanol and made alkaline with methanolic sodium methylate solution. The product is filtered off with suction, washed with methanol and water and dried. This gives 19.5 g (79.7%) of a brownish powder. In one isomeric form it corresponds to the formula ##STR122## λmax in glacial acetic acid: 874 nm. In contact with acid clay: greenish grey, 750 to 950 nm.

EXAMPLE 90

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) ethylene and 7.39 g of 1,1,3,3-tetramethoxycyclohexane are boiled in a mixture of 50 ml of acetic anhydride and 2.5 g of methane sulphonic acid for 1 hour. After cooling, the blue solution containing the dyestuff of the formula ##STR123## is poured into 200 ml of methanol and made alkaline with ethanolic sodium methylate solution. The product is filtered off with suction, washed with ethanol and water and dried. This gives 17.3 g (69.5%) of a brownish ochre powder. In one isomeric form it corresponds to the formula: ##STR124## λmax in glacial acetic acid: 796 nm.

The following examples can be prepared analogously:

__________________________________________________________________________ ##STR125##                                      λmax in glacialExampleR5     R6   Q2 T11                            T12                                 T13                                      acetic acid__________________________________________________________________________61   CH3      ##STR126##               CH3                       H                             ##STR127##                                      797 nm62   CH3      ##STR128##               CH3                       H                             ##STR129##                                      794 nm63   n-C4 H9      ##STR130##               CH3                       H    CH2CH 2                                      803 nm64   CH3      ##STR131##               C2 H5                       CH3                             ##STR132##                                      795 nm65   CH3     n-C4 H9                ##STR133##                       H                             ##STR134##                                      760 nm66   CH3      ##STR135##               CH3                       H    CH3                                 CH3                                      798 nm67   CH3      ##STR136##               CH3                       H    H    CH3                                      880 nm__________________________________________________________________________
EXAMPLE 68

3.35 g of 1,1,3-tris(1-methyl-2-phenylindol-3-yl) 1,3-butadiene and 2.33 g of 1,1-bis(1-methyl-2-phenylindol-3-yl)-1-propen-3-al are stirred in a mixture of 30 ml of acetic anhydride, 5 ml of glacial acetic acid and 0.5 g of ethanesulphonic acid at 80 to 90 C. for 10 hours. After cooling, the blue solution containing the dyestuff of the formula ##STR137## is poured into 150 ml of methanol and made alkaline at 40 to 45 C. with 170 ml of 30% strength methanolic sodium methylate solution. The product is filtered off with suction, washed with methanol and water and dried. This gives 3.3 g (57.3% of theory) of a beige powder of melting point 198 to 200 C. (decomposition). The product in one isomeric form corresponds to the formula ##STR138## λmax in glacial acetic acid: 876 nm. In contact with acid clay: bluish grey, 750 to 950 nm.

EXAMPLE 69

9.3 g of 1,1-bis(1-methyl-2-phenylindol-3-yl)-1-propen-3-al and 1.0 g of malonic acid are refluxed in 30 ml of phosphorus oxychloride for 90 minutes. After cooling, the mixture is poured into 500 ml of water, stirred for 30 minutes, the product is filtered off with suction and dried: 10.4 g. The resulting dyestuff of the formula ##STR139## is taken up in 100 ml of ethanol and is made alkaline with sodium ethylate solution. This gives 7.4 g (72%) of a brown-beige powder. In one isomeric form it corresponds to the formula: ##STR140## λmax in glacial acetic acid: 843 nm.

EXAMPLE 70

11.3 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) propene, 12.5 g of 1,1-bis(1-methyl-2-(4-methoxyphenyl) indol-3-yl)-ethylene and 4.3 g of 1,1,3,3-tetramethoxypropane are reacted as in Example 1. This gives 19.4 g of a brownish beige powder which consists of a mixture (about 3:3:1) of the products of Examples 6 and 25 and the compound of the formula (in one isomeric form) ##STR141## λmax in glacial acetic acid: 866 nm. In contact with acid clay: greenish grey, 750 to 950 nm.

EXAMPLE 71

The procedure of Example 1 is repeated, except that the black-blue solution is poured into 200 ml of 1-butanol. Over a period of 1.5 hours, 83.4 g of potassium tert.-butylate are dispersed in the mixture and, towards the end of the addition, the mixture is refluxed for 2 hours. After cooling, the product is filtered off with suction and washed with 1-butanol and hexane and then with water. The product is dried to give 19.5 g (79.1%) of a beige powder of melting point 213 to 217 C. It contains the ethers of Example 18 and of the formula (in one isomeric form) ##STR142## in a ratio of about 85:15. λmax in glacial acetic acid: 860 nm.

EXAMPLE 72

3 g of the tetraindolylheptamethine ether of Example 18 are dissolved in a mixture of 40 g of dodecylbenzene and 60 g of chloroparaffin having a Cl content of 45% (Marlican from Hulus Co.). 223 g of this solution are mixed with 39.5 g of the oxadiazinetrione of Desmodur H (NCO content 20.5%). This mixture is then mixed with 320 g of 0.5% strength polyvinyl alcohol solution and emulsified in the shear gradient of a rotor/stator emulsifier. The crosslinking is carried out using 76 g of 9.0% strength diethylenetriamine solution. The aftertreatment is carried out by heating the dispersion to 60 C. and stirring at 60 C. for 3 hours. This gives a dispersion containing 40% of capsules of the capsule size 7.3 μm.

250 ml of this dispersion are initially introduced and 40 g of fine cellulose powder (Arbocell BE 600/30 from Rettenmeier und Sohne) are slowly added to the dispersion with vigorous stirring. After a minimum of 30 minutes of vigorous stirring, 40 ml of 50% strength SBR latex (Baystal D 1600 from BAYER AG) are added. The resulting 48.5% strength coating composition is diluted with water to a solids content of 30% and applied to the back of a commercially available base paper using an air brush. The add-on after drying is 5 g/m2.

The paper thus coated is placed with the coated side on that side of a commercially available carbon-free copying paper which is coated with developer. The pressure applied by writing on the paper coated with capsules gives, on the copying paper, a grey-blue copy which has a strong absorption in the near infrared region from 750 to 950 nm.

The other examples too can be used analogously.

EXAMPLE 73

A solution of 2 g of the tetraindolylheptamethine ether of Example 6 and 3 g of a benzoxazine of the formula ##STR143## such as has been described in EP 187,329, in 80 g of diisopropylnaphthalene and 17 g of kerosine is microencapsulated in a known manner with gelatin and gum arabic by coazervation, mixed with starch solution and coated onto a sheet of paper. This sheet is placed with the coated side on that side of a commercially available carbon-free copying paper which is coated with developer. The pressure applied by writing on the paper coated with capsules gives, on the copying paper, an intensive black copy which likewise has a strong absorption in the near infrared from 750 to 950 nm.

EXAMPLE 74

In a ball mill, 32 g of 4,4'-isopropylidenediphenol (bisphenol A), 3.8 g of distearylamide of ethylene diamine, 89 g of kaolin, 20 g of a polyvinyl alcohol hydrolysed to 88% and 55 ml of water are ground until the particle size is about 5 μm. In a second ball mill, 6 g of the tetraindolylheptamethine ether of Example 58, 3 g of a polyvinyl alcohol hydrolysed to 88% and 60 ml of water are ground until the particle size is about 3 μm. The two dispersions are combined and coated onto paper giving a dry add-on weight of 5.5 g/m2. Bringing the paper into contact with a heated pen develops a greenish grey recording which shows a strong absorption in the near infrared from 750 to 950 nm.

EXAMPLE 75

0.96 g of methanesulphonic acid is added to 9.44 g of the ether of Example 1 in 37 ml of methanol, and the mixture is refluxed for 5 minutes. After cooling, a stable, about 25% strength methanolic solution of the dyestuff of the formula ##STR144## is obtained. After adding a binder and adjusting the desired dyestuff concentration, it is suitable for the preparation of optical recording materials. If it is intended to isolate the dyestuff, the methanol must be evaporated in vacuo. In this manner, 10.1 g (100%) of the above dyestuff are obtained as blue flakes of melting point 192 to 195 C.

Solubility in butanol: >333 g/l,

Solubility in methanol: >333 g/l,

λmax in glacial acetic acid: 863 nm.

Examples 2 to 71 can be treated exactly analogously, such a highly concentrated methanolic solution not being stable in all cases.

EXAMPLE 76

0.96 g of methanesulphonic acid is added to 12.5 g of the ether of Example 5 in 40 ml of methanol, and the mixture is boiled for 5 minutes. Upon cooling, a fine blue powder precipitates, which is filtered off with suction and dried. This gives 12.1 g (92.4%) of the dyestuff of the formula ##STR145## of melting point 165 to 168 C. Solubility in butanol: >200 g/l,

Solubility in methylene chloride: >100 g/l,

λmax in glacial acetic acid: 874 nm.

EXAMPLE 77

21.9 g of 1,1-bis(1-methyl-2-phenylindol-3-yl) ethylene, 4.3 g of 1,1,3,3-tetramethoxypropane, 4.94 g of p-toluenesulphonic acid containing water of crystallization, and 50 ml of acetic anhydride are stirred at 80 to 90 C. for 1 to 2 hours. After cooling, the mixture is poured into 200 ml of methanol and stirred for 2 hours. The solvent is completely removed in vacuo. This gives 10.8 g (100%) of blue flakes of the formula ##STR146## of melting point 170 to 173 C. Solubility in methanol: >333 g/l,

Solubility in butanol: >333 g/l,

λmax is glacial acetic acid: 863 nm.

EXAMPLE 78

26.1 g of 1,1-bis(1-butyl-2-phenylindol-3-yl) ethylene, 4.3 g of 1,1,3,3-tetramethoxypropane and 3.95 g of benzenesulphonic acid are stirred in 37 g of n-butanol at 80 to 90 C. for 7 hours. This gives an approximately 25% strength butanolic solution of the dyestuff of the formula ##STR147## After adding a binder and adjusting the desired dyestuff concentration, it is suitable for the preparation of optical recording materials.

EXAMPLE 79

3.3 g of the ether of Example 47 are boiled together with 342 g of trifluoroacetic acid in 10 g of methanol for 1 hour. This gives an approximately 25% strength methanolic solution of the dyestuff of the formula ##STR148## After adding a binder and adjusting the desired dyestuff concentration, it is suitable for the preparation of optical recording materials.

If it is intended to isolate the dyestuff, the methanol must be evaporated in vacuo. This gives 3.48 g (100%) of the above dyestuff as blue flakes of melting point 155 to 159 C.

Solubility in butanol: >333 g/l,

Solubility in methanol: >333 g/l,

λmax in glacial acetic acid: 859 nm.

Examples 1 to 46 and 48 to 71 can be treated exactly analogously, such a highly concentrated methanolic solution not being stable in all cases.

EXAMPLE 80

A 5% strength solution of the tetraindolylheptamethine dyestuff of Example 78 in butanol/methanol 2:1, which contains 2.5% of a polymer based on polyvinyl acetate, is applied by the spin coating process to a base sheet made of polymethyl methacrylate, a layer of 0.8 μm being formed. The sheet can be written and read by means of a semiconductor laser.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2154926 *Sep 15, 1937Apr 18, 1939Gen Aniline Works IncDyestuffs of the triarylmethane series
US2158287 *Jul 19, 1934May 16, 1939Agfa Ansco CorpSensitizing silver halide emulsion
US3957288 *Dec 27, 1973May 18, 1976Agfa-Gevaert N.V.Thermographic recording material
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5397690 *Mar 16, 1994Mar 14, 1995E. I. Du Pont De Nemours And CompanyNear-infrared absorbing dyes prepared from stenhouse salts
US6586107Oct 11, 2001Jul 1, 2003Bayer AktiengesellschaftMicrocapsules having polyurea walls
US6797670Oct 11, 2001Sep 28, 2004Bayer AktiengesellschaftMicrocapsules having polyurea walls
US20040064053 *Sep 30, 2002Apr 1, 2004Chang Sung K.Diagnostic fluorescence and reflectance
Classifications
U.S. Classification548/455, 430/270.18, 546/176, 427/144, 548/459
International ClassificationC09B23/00, C09B23/08, B41M5/323, B41M5/136
Cooperative ClassificationB41M5/136, C09B23/086, B41M5/323
European ClassificationB41M5/323, B41M5/136, C09B23/08D
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